import 'dart:math' as math;

import 'package:wolf_dart/classes/coordinate_2d.dart';
import 'package:wolf_dart/features/entities/enemies/enemy.dart';
import 'package:wolf_dart/features/entities/entity.dart';

class BrownGuard extends Enemy {
  static const double speed = 0.03;
  bool _hasFiredThisCycle = false;

  BrownGuard({
    required super.x,
    required super.y,
    required super.angle,
    required super.mapId,
  }) : super(
         // Default front-facing idle
         spriteIndex: 50,
         state: EntityState.idle,
       );

  static BrownGuard? trySpawn(
    int objId,
    double x,
    double y,
    int difficultyLevel,
  ) {
    bool canSpawn = false;
    switch (difficultyLevel) {
      case 0:
        canSpawn = objId >= 108 && objId <= 115;
        break;
      case 1:
        canSpawn = objId >= 144 && objId <= 151;
        break;
      case 2:
        canSpawn = objId >= 180 && objId <= 187;
        break;
      case 3:
        canSpawn = objId >= 216 && objId <= 223;
        break;
    }

    if (canSpawn) {
      return BrownGuard(
        x: x,
        y: y,
        angle: Enemy.getInitialAngle(objId),
        mapId: objId,
      );
    }
    return null; // Not a Brown Guard!
  }

  @override
  @override
  void update({
    required int elapsedMs,
    required Coordinate2D playerPosition,
    required bool Function(int x, int y) isWalkable,
    required void Function(int damage) onDamagePlayer,
  }) {
    // 1. Wake up logic
    if (state == EntityState.idle &&
        hasLineOfSight(playerPosition, isWalkable)) {
      state = EntityState.patrolling;
      lastActionTime = elapsedMs;
    }

    // 2. Pre-calculate angles (needed for almost all states)
    double dx = playerPosition.x - x;
    double dy = playerPosition.y - y;
    double distance = math.sqrt(dx * dx + dy * dy);
    double angleToPlayer = math.atan2(dy, dx);

    // Face the player if active
    if (state != EntityState.idle && state != EntityState.dead) {
      angle = angleToPlayer;
    }

    double diff = angle - angleToPlayer;
    while (diff <= -math.pi) {
      diff += 2 * math.pi;
    }
    while (diff > math.pi) {
      diff -= 2 * math.pi;
    }

    int octant = ((diff + (math.pi / 8)) / (math.pi / 4)).floor() % 8;
    if (octant < 0) octant += 8;

    // 3. State Machine
    switch (state) {
      case EntityState.idle:
        spriteIndex = 50 + octant;
        break;

      case EntityState.patrolling:
        // Movement
        if (distance > 0.8) {
          double moveX = x + math.cos(angle) * speed;
          double moveY = y + math.sin(angle) * speed;
          if (isWalkable(moveX.toInt(), y.toInt())) x = moveX;
          if (isWalkable(x.toInt(), moveY.toInt())) y = moveY;
        }
        // Animation
        int walkFrame = (elapsedMs ~/ 150) % 4;
        spriteIndex = 58 + (walkFrame * 8) + octant;
        // Shooting transition
        if (distance < 5.0 && elapsedMs - lastActionTime > 2000) {
          if (hasLineOfSight(playerPosition, isWalkable)) {
            state = EntityState.shooting;
            lastActionTime = elapsedMs;
            _hasFiredThisCycle = false;
          }
        }
        break;

      case EntityState.shooting:
        int timeShooting = elapsedMs - lastActionTime;
        if (timeShooting < 150) {
          spriteIndex = 96;
        } else if (timeShooting < 300) {
          spriteIndex = 97;
          if (!_hasFiredThisCycle) {
            onDamagePlayer(10);
            _hasFiredThisCycle = true;
          }
        } else if (timeShooting < 450) {
          spriteIndex = 98;
        } else {
          state = EntityState.patrolling;
          lastActionTime = elapsedMs;
        }
        break;

      case EntityState.pain:
        spriteIndex = 90;
        if (elapsedMs - lastActionTime > 250) {
          // Slight delay
          state = EntityState.patrolling;
          lastActionTime = elapsedMs; // Reset so they don't immediately shoot
        }
        break;

      case EntityState.dead:
        if (isDying) {
          // Use max(0, ...) to prevent negative numbers if currentTime is wonky
          int timeSinceDeath = math.max(0, elapsedMs - lastActionTime);
          int deathFrame = timeSinceDeath ~/ 150;

          if (deathFrame < 4) {
            spriteIndex = 91 + deathFrame;
          } else {
            spriteIndex = 95; // The final corpse
            isDying = false; // Stop animating
          }
        } else {
          spriteIndex = 95; // Keep showing the corpse
        }
        break;
      default:
        break;
    }
  }
}